test/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-b-i-21.js


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// Copyright (c) 2012 Ecma International.  All rights reserved.
// Ecma International makes this code available under the terms and conditions set
// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the
// "Use Terms").   Any redistribution of this code must retain the above
// copyright and this notice and otherwise comply with the Use Terms.

/*---
es5id: 15.4.4.15-8-b-i-21
description: >
    Array.prototype.lastIndexOf - element to be retrieved is inherited
    accessor property without a get function on an Array
includes: [runTestCase.js]
---*/

function testcase() {
        try {
            Object.defineProperty(Array.prototype, "0", {
                set: function () { },
                configurable: true
            });
            return [, ].lastIndexOf(undefined) === 0;
        } finally {
            delete Array.prototype[0];
        }
    }
runTestCase(testcase);